Tom Bussey
03-14-2021, 5:37 PM
Flattening chisel backs my way.
I like to have my chisel backs flat. I built a fixture so that I could grind the sides. I have to have then parallel within .001 or the vise can't clamp on them.
454423 454424
Then I can clamp on the sides, indicate the flat flat side as parallel as I can get it andgrind the back. it took about .005 off from each to get them just to clean up. I redressed the wheel, and picked up the surface of the chisel with the grinding wheel. For the final cut the depth of cut was .0003 and then there was a total of 3 spark out passes. Now the only stone the back of the chisel will se is the 8000 grit one
454425 454426
The chisels shown are Marples that I purchased new about 35 years ago for $29 and they have seen a lot of rough use.I plan on finishing the other 3 next week and give them to my son inlaw.
And then my plans are to angle the bottom of the fixture to 20 degrees and then grind the sides of a few chisels Narex premium chisels, back about 2 inches and make them into dovetail chisels. I read the information on them and they are hardened to a Rockwell "C" for 59. Being primarilly a die maker, we tempered our die steel to 58-60 rockwell, any harder and the steel tended to be to brittle and didn't hold up the cutting forces, in operation, in the press. The Narex chisels handles are wood and will the chisel will be used with a mallet so there will be some shock to the cutting edge and that is why I chose the premium chisel and not the Ricter chisel. Not to mention cost.
I like to have my chisel backs flat. I built a fixture so that I could grind the sides. I have to have then parallel within .001 or the vise can't clamp on them.
454423 454424
Then I can clamp on the sides, indicate the flat flat side as parallel as I can get it andgrind the back. it took about .005 off from each to get them just to clean up. I redressed the wheel, and picked up the surface of the chisel with the grinding wheel. For the final cut the depth of cut was .0003 and then there was a total of 3 spark out passes. Now the only stone the back of the chisel will se is the 8000 grit one
454425 454426
The chisels shown are Marples that I purchased new about 35 years ago for $29 and they have seen a lot of rough use.I plan on finishing the other 3 next week and give them to my son inlaw.
And then my plans are to angle the bottom of the fixture to 20 degrees and then grind the sides of a few chisels Narex premium chisels, back about 2 inches and make them into dovetail chisels. I read the information on them and they are hardened to a Rockwell "C" for 59. Being primarilly a die maker, we tempered our die steel to 58-60 rockwell, any harder and the steel tended to be to brittle and didn't hold up the cutting forces, in operation, in the press. The Narex chisels handles are wood and will the chisel will be used with a mallet so there will be some shock to the cutting edge and that is why I chose the premium chisel and not the Ricter chisel. Not to mention cost.